A survey of sixth-grader students recorded how many hours students studied each week. The histogram below displays the collected information. Which interval shows the greatest number of students?
0 - 1.99
2 - 3.99
4 - 5.99
6 - 7.99

Given: ae ≅ ce ; de ≅ be prove: abcd is a parallelogram. we have that ab || dc. by a similar argument used to prove that △aeb ≅ △ced, we can show that △ ≅ △ceb by. so, ∠cad ≅ ∠ by cpctc. therefore, ad || bc by the converse of the theorem. since both pair of opposite sides are parallel, quadrilateral abcd is a parallelogram.